Trekipedia

Frank

Human. Brother of Winona Kirk,^[4] and uncle of James Tiberius Kirk and George Samuel Kirk, Jr.^{[1, 2, 3]}

ST11 Timeline

After the death of his brother-in-law, Frank took in his nephews George and Jim at his home in Riverside, Iowa, when his sister,^[4] Winona was off-planet due to her duties as a Starfleet officer.^{[1, 2, 3]} After his death aboard the U.S.S. Kelvin NCC-0514, George left his classic Chevrolet Corvette to his brother, Frank.^{[2, 3]}

Portrayed by Greg Grunberg (voice). In the deleted scenes available on the Star Trek (2009) DVD and Blu-Ray releases, Frank was portrayed by Brad William Henke.